to the headline out of syria tonight. Reports that members of an elite syrian unit are on the move this evening, working to move chemical weapons to new locations to protect them, as the u.S. Counts on russia to get syria to dismantle its chemical weapons. Look at this map tonight. These are just some of the sights where syria is believed to be storing the weapons. Now comes the question, are they simply using this time to hide them while they can? I want to bring in abc's chief white house correspondent jonathan karl tonight. Jon, is the white house concerned about this? Reporter: Well, there is certainly some concern about this, david, but they say they are fully aware of the movements of these chemical weapons. In fact, they say that some of the most recent movement has been consolidating them into smaller -- bigger stock piles, but fewer. And they say that the bottom line is, they have been spending a lot of resources, intelligence resources, in monitoring those weapons and they feel they have a very good handle on where they are. The bigger challenge, david, frankly, will be coming up with a plan, because there is no one yet, on how they will eventually turn them over and destroy them if they can get this agreement with the russians.

This transcript has been automatically generated and may not be 100% accurate.

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